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package kamon.trace
import java.nio.ByteBuffer
import java.util.concurrent.ThreadLocalRandom
import kamon.util.HexCodec
import scala.util.Try
trait IdentityProvider {
def traceIdGenerator(): IdentityProvider.Generator
def spanIdGenerator(): IdentityProvider.Generator
}
object IdentityProvider {
case class Identifier(string: String, bytes: Array[Byte]) {
override def equals(obj: Any): Boolean = {
if(obj != null && obj.isInstanceOf[Identifier])
obj.asInstanceOf[Identifier].string == string
else false
}
}
val NoIdentifier = Identifier("", new Array[Byte](0))
trait Generator {
def generate(): Identifier
def from(string: String): Identifier
def from(bytes: Array[Byte]): Identifier
}
class Default extends IdentityProvider {
protected val longGenerator = new Generator {
override def generate(): Identifier = {
val data = ByteBuffer.wrap(new Array[Byte](8))
val random = ThreadLocalRandom.current().nextLong()
data.putLong(random)
Identifier(HexCodec.toLowerHex(random), data.array())
}
override def from(string: String): Identifier = Try {
val identifierLong = HexCodec.lowerHexToUnsignedLong(string)
val data = ByteBuffer.allocate(8)
data.putLong(identifierLong)
Identifier(string, data.array())
} getOrElse(IdentityProvider.NoIdentifier)
override def from(bytes: Array[Byte]): Identifier = Try {
val buffer = ByteBuffer.wrap(bytes)
val identifierLong = buffer.getLong
Identifier(HexCodec.toLowerHex(identifierLong), bytes)
} getOrElse(IdentityProvider.NoIdentifier)
}
override def traceIdGenerator(): Generator = longGenerator
override def spanIdGenerator(): Generator = longGenerator
}
object Default {
def apply(): Default = new Default()
}
class DoubleSizeTraceID extends Default {
private val doubleLongGenerator = new Generator {
override def generate(): Identifier = {
val data = ByteBuffer.wrap(new Array[Byte](16))
val highLong = ThreadLocalRandom.current().nextLong()
val lowLong = ThreadLocalRandom.current().nextLong()
data.putLong(highLong)
data.putLong(lowLong)
Identifier(HexCodec.toLowerHex(highLong) + HexCodec.toLowerHex(lowLong), data.array())
}
override def from(string: String): Identifier = Try {
val highPart = HexCodec.lowerHexToUnsignedLong(string.substring(0, 16))
val lowPart = HexCodec.lowerHexToUnsignedLong(string.substring(16, 32))
val data = ByteBuffer.allocate(16)
data.putLong(highPart)
data.putLong(lowPart)
Identifier(string, data.array())
} getOrElse(IdentityProvider.NoIdentifier)
override def from(bytes: Array[Byte]): Identifier = Try {
val buffer = ByteBuffer.wrap(bytes)
val highLong = buffer.getLong
val lowLong = buffer.getLong
Identifier(HexCodec.toLowerHex(highLong) + HexCodec.toLowerHex(lowLong), bytes)
} getOrElse(IdentityProvider.NoIdentifier)
}
override def traceIdGenerator(): Generator = doubleLongGenerator
}
object DoubleSizeTraceID {
def apply(): DoubleSizeTraceID = new DoubleSizeTraceID()
}
}
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